如何在ListView中使用OnItemClickListener获取其他列

Question

我在购物清单上工作，您可以在其中单击列表视图中的项目，并出现对话框。在那里您可以修改产品名称。它可以正常工作，但是现在我正在尝试添加详细信息。添加到数据库已经有效。它是在第三列中，但现在我无法使用OnItemClickListener将其取出。从第二列中获取数据正常，因此该产品使用itemOnClick可以正常工作。

我已经尝试了几个代码，但没有找到解决方案。

OnItemClick：

    lvProducts.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            try {
                //DB*********************************
                String name = parent.getItemAtPosition(position).toString();
                Log.d(TAG, "onItemClick: You Clicked on " + name);
                Cursor data = myDB.getItemID(name);
                int itemID = -1;
                while (data.moveToNext()){
                    itemID = data.getInt(0);

                }
                if (itemID > -1){
                    Log.d(TAG, "onItemClick: The ID is " + itemID);
                    Intent editScreenIntent = new Intent();
                    editScreenIntent.putExtra("id",itemID);
                    editScreenIntent.putExtra("name",name);
                    selectedID = editScreenIntent.getIntExtra("id",-1);
                    selectedName = editScreenIntent.getStringExtra("name");
                }



                showInputBox(arrayList.get(position), position);
            } catch (Exception e) {
                Toast.makeText(ShoppingActivity.this, "Error#666", Toast.LENGTH_SHORT).show();
            }
        }
    });

databasehelper：

public class DatabaseHelper extends SQLiteOpenHelper {
    public static final String TABLE_NAME = "myList_data";
    public static final String COL1 = "ID";
    public static final String COL2 = "ITEM1";
    public static final String COL3 = "ITEM2";
    public DatabaseHelper(Context context){
        super(context, TABLE_NAME, null, 1);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " + COL2 + " TEXT, " + COL3 + " TEXT )";
        db.execSQL(createTable);
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS "+ TABLE_NAME);
        onCreate(db);
    }
    public boolean addData(String item, String detail){
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(COL2,item);
        contentValues.put(COL3, detail);
        long result = db.insert(TABLE_NAME,null,contentValues);
        if (result == -1){
            return false;
        }else {
            return true;
        }
    }



    public Cursor getData(){
        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM " + TABLE_NAME;
        Cursor data = db.rawQuery(query, null);
        return data;
    }
    public Cursor getItemID(String name){
        SQLiteDatabase db = this.getWritableDatabase();
        //String query = "SELECT "+ COL1 + " FROM " + TABLE_NAME + " WHERE " + COL2 + " = '" + name + "'";
        Cursor data = db.rawQuery("SELECT * FROM " + TABLE_NAME,null);
        //Cursor data = db.rawQuery(query, null);
        return data;
    }


    /**
     * Updates the name field
     * @param newName
     * @param id
     * @param oldName
     */
    public void updateName(String newName,int id,String oldName){
        SQLiteDatabase db = this.getWritableDatabase();
        String query = "UPDATE " + TABLE_NAME + " SET " + COL2 + " = '" + newName + "' WHERE " + COL1 + " = '" + id + "'" + " AND " + COL2 + " = '" + oldName + "'";
        db.execSQL(query);
    }
    public void deleteName(int id, String name){
        SQLiteDatabase db = this.getWritableDatabase();
        String query = "DELETE FROM " + TABLE_NAME + " WHERE " + COL1 + " = '" + id + "'" + " AND " + COL2 + " = '" + name + "'";
        db.execSQL(query);
    }
    public void deleteAll(){
        SQLiteDatabase db = this.getWritableDatabase();
        db.delete(TABLE_NAME,null,null);
        String query =("DELETE FROM " + TABLE_NAME);
        db.execSQL(query);
    }
}

Answer 1

尝试： -

            int itemID = -1;
            String item3 = ""; //<<<<<<<<<< ADDED
            while (data.moveToNext()){
                itemID = data.getInt(0);
                item3 = data.getString(data.getColumnIndex(DatabaseHelper.COL3)); //<<<<<<<<<< ADDED
            }

• 使用GetColumnIndex注意，列名称更加灵活，并且更不容易误解偏移。您可能希望考虑将itemID = data.getInt(0);更改为itemID = data.getInt(data.getColumnIndex(DatabaseHelper.COL1));

您的 getItemid 方法将会，因为它的站立不仅是所有具有名称的行。您可能希望从以下方式更改： -

public Cursor getItemID(String name){
    SQLiteDatabase db = this.getWritableDatabase();
    //String query = "SELECT "+ COL1 + " FROM " + TABLE_NAME + " WHERE " + COL2 + " = '" + name + "'";
    Cursor data = db.rawQuery("SELECT * FROM " + TABLE_NAME,null);
    //Cursor data = db.rawQuery(query, null);
    return data;
}

to： -

public Cursor getItemID(String name){
    SQLiteDatabase db = this.getWritableDatabase();
    return db.query(TABLE_NAME,null,COL2+"=?",new String[]{name},null,null,null);
}

• 请注意，以上是原理中代码。它尚未进行测试或运行，因此可能会有一些错误。